Removed "all" from filter definition in ArenaOfTheAncients.java. Implemented BlinkmothUrn.java. Fixed bug in AmberPrison.java so that the controller is prompted whether to untap or not; before it was automatically untapping without asking.

Mage.Sets/src/mage/sets/legends/ArenaOfTheAncients.java

@@ -26,7 +26,7 @@ import mage.filter.predicate.mageobject.SupertypePredicate;
  */
 public class ArenaOfTheAncients extends CardImpl {
     
-    final static FilterCreaturePermanent legendaryFilter = new FilterCreaturePermanent("all legendary creatures");
+    final static FilterCreaturePermanent legendaryFilter = new FilterCreaturePermanent("legendary creatures");
     static {
         legendaryFilter.add(new SupertypePredicate("Legendary"));
     }

Mage.Sets/src/mage/sets/mirage/AmberPrison.java

@@ -178,7 +178,8 @@ class AmberPrisonUntapTriggeredAbility extends TriggeredAbilityImpl {
 
     @Override
     public boolean checkTrigger(GameEvent event, Game game) {
-        return event.getType().equals(GameEvent.EventType.UNTAPPED) && event.getTargetId().equals(this.getSourceId());
+        return event.getType().equals(GameEvent.EventType.UNTAP) && event.getTargetId().equals(this.getSourceId());
+                
     }
     
 }

Mage.Sets/src/mage/sets/mirrodin/BlinkmothUrn.java

@@ -0,0 +1,83 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mage.sets.mirrodin;
+
+import java.util.UUID;
+import mage.Mana;
+import mage.abilities.Ability;
+import mage.abilities.common.BeginningOfPreCombatMainTriggeredAbility;
+import mage.abilities.effects.OneShotEffect;
+import mage.cards.CardImpl;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.Rarity;
+import mage.constants.TargetController;
+import mage.filter.common.FilterArtifactPermanent;
+import mage.filter.predicate.permanent.ControllerIdPredicate;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+
+/**
+ *
+ * @author nickmyers
+ */
+public class BlinkmothUrn extends CardImpl {
+    
+    public BlinkmothUrn(UUID ownerId) {
+        super(ownerId, 145, "Blinkmoth Urn", Rarity.RARE, new CardType[]{CardType.ARTIFACT}, "{5}");
+        this.expansionSetCode = "MRD";
+        
+        // At the beginning of each player's precombat main phase, if 
+        // Blinkmoth Urn is untapped, that player adds {1} to his or her 
+        // mana pool for each artifact he or she controls.
+        this.addAbility(new BeginningOfPreCombatMainTriggeredAbility(new BlinkmothUrnEffect(), TargetController.ANY, false));
+    }
+    
+    public BlinkmothUrn(final BlinkmothUrn card) {
+        super(card);
+    }
+
+    @Override
+    public BlinkmothUrn copy() {
+        return new BlinkmothUrn(this);
+    }
+    
+}
+
+class BlinkmothUrnEffect extends OneShotEffect {
+    
+    public BlinkmothUrnEffect() {
+        super(Outcome.PutManaInPool);
+        this.staticText = "if Blinkmoth Urn is untapped, that player adds {1} to his or her mana pool for each artifact he or she controls";
+    }
+    
+    public BlinkmothUrnEffect(final BlinkmothUrnEffect effect) {
+        super(effect);
+    }
+    
+    @Override
+    public BlinkmothUrnEffect copy() {
+        return new BlinkmothUrnEffect(this);
+    }
+    
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(game.getActivePlayerId());
+        FilterArtifactPermanent filter = new FilterArtifactPermanent("artifacts you control");
+        filter.add(new ControllerIdPredicate(game.getActivePlayerId()));
+        Permanent sourcePermanent = game.getPermanent(source.getSourceId());
+        if(player != null && sourcePermanent != null && !sourcePermanent.isTapped()) {
+            player.getManaPool().addMana(Mana.ColorlessMana(
+                    game.getState().
+                            getBattlefield().
+                            getActivePermanents(filter, source.getControllerId(), source.getSourceId(), game).
+                            size()), game, source, true);
+            return true;
+        }
+        return false;
+    }
+}